<template>
    <div class="app-container">
        <h2 style="text-align: center;">发布新课程</h2>
        <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
            <el-step title="填写课程基本信息" />
            <el-step title="创建课程大纲" />
            <el-step title="最终发布" />
        </el-steps>

        <el-button type="text" @click="openChapterDialog">添加章节</el-button>

        <!-- 章节 -->
        <ul class="chanpterList">
            <li v-for="chapter in chapterVideoList" :key="chapter.id">
                <p>
                    {{ chapter.title }}
                    <span class="acts">
                        <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                        <el-button style="" type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                        <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                    </span>
                </p>
                <!-- 视频 -->
                <ul class="chanpterList videoList">
                    <li v-for="video in chapter.children" :key="video.id">
                        <p>{{ video.title }}

                            <span class="acts">
                                <el-button style="" type="text" @click="openEditVideo(video.id)">编辑</el-button>
                                <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                            </span>
                        </p>
                    </li>
                </ul>
            </li>
        </ul>
        <div>
            <el-button @click="previous">上一步</el-button>
            <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
        </div>

        <!-- 添加和修改章节表单 -->
        <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
            <el-form :model="chapter" label-width="120px">
                <el-form-item label="章节标题">
                    <el-input v-model="chapter.title" />
                </el-form-item>
                <el-form-item label="章节排序">
                    <el-input-number v-model="chapter.sort" :min="0" controls-position="right" />
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
                <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
            </div>
        </el-dialog>

        <!-- 添加和修改课时表单 -->
        <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
            <el-form :model="video" label-width="120px">
                <el-form-item label="课时标题">
                    <el-input v-model="video.title" />
                </el-form-item>
                <el-form-item label="课时排序">
                    <el-input-number v-model="video.sort" :min="0" controls-position="right" />
                </el-form-item>
                <el-form-item label="是否免费">
                    <el-radio-group v-model="video.free">
                        <el-radio :label="true">免费</el-radio>
                        <el-radio :label="false">默认</el-radio>
                    </el-radio-group>
                </el-form-item>
                <el-form-item label="上传视频">
                    <el-upload
                        :on-success="handleVodUploadSuccess"
                        :on-remove="handleVodRemove"
                        :before-remove="beforeVodRemove"
                        :on-exceed="handleUploadExceed"
                        :file-list="fileList"
                        :action="BASE_API+'/eduvod/video/uploadAlyiVideo'"
                        :limit="1"
                        class="upload-demo">
                    <el-button size="small" type="primary">上传视频</el-button>
                    <el-tooltip placement="right-end">
                        <div slot="content">最大支持1G，<br>
                            支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                            GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                            MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                            SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                        <i class="el-icon-question"/>
                    </el-tooltip>
                    </el-upload>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
                <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
            </div>
        </el-dialog>
    </div>
</template>
<script> 
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'
export default {
    data(){
        return{
            saveBtnDisabled:false,
            courseId:'',//课程id
            chapterVideoList:[],
            chapter:{ //封装章节数据
                title: '',
                sort: 0
            },
            video:{
                title: '',
                sort: 0,
                free: 0,
                videoSourceId: '',
                videoOriginalName:''//视频名称
            },
            dialogChapterFormVisible:false,//章节弹框
            dialogVideoFormVisible:false,//小节弹框
            fileList: [],//上传文件列表
            BASE_API: process.env.BASE_API // 接口API地址
        }
    },
    created(){
        //获取路由的id值
        if(this.$route.params && this.$route.params.id){
            this.courseId = this.$route.params.id
            //根据课程id查询章节和小节
            this.getChapterVideo()
        }

    },
    methods:{
        //点击确定调用的方法
        handleVodRemove(){
            //调用接口的删除视频的方法
            video.deleteAliyunvod(this.video.videoSourceId)
                .then(response =>{
                    //提示信息
                    this.$message({
                            type: 'success',
                            message: '删除视频成功!'
                        })
                        //把文件列表清空
                        fileList: []
                        //把video视频id和视频名称值清空
                        //上传视频id赋值
                        this.video.videoSourceId = ''
                        //上传视频名称赋值
                        this.video.videoOriginalName = ''

                })
        },
        //点击×调用这个方法
        beforeVodRemove(file, fileList){
            return this.$confirm(`确定移除 ${ file.name }？`);
        },
        //上传视频成功调用的方法
        handleVodUploadSuccess(response, file, fileList){
            //上传视频id赋值
            this.video.videoSourceId =  response.data.videoId
            //上传视频名称赋值
            this.video.videoOriginalName = file.name
        },
        handleUploadExceed(){
            this.$message.warning('想要重新上传视频，请先删除已上传的视频')
        },
        //================================小节操作=========================================
        openVideo(chapterId){
            //弹框
            this.dialogVideoFormVisible=true
            
            //设置章节id
            this.video.chapterId = chapterId

            //表单数据清空
            this.video.title=''
            this.video.sort=0
            this.video.free=0
            this.video.videoSourceId=''
            this.fileList = []
        },
        //删除小节
        removeVideo(id){
            this.$confirm('此操作将永久删除小节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {//点击确定，执行then方法
                //调用删除方法
                video.deleteVideo(id)
                    .then(response=>{//删除成功
                        //提示信息
                        this.$message({
                            type: 'success',
                            message: '删除小节成功!'
                        })
                        //刷新页面
                        this.getChapterVideo()
                    })
            })    
        },
        //添加小节
        addVideo(){
            //设置课程id
            this.video.courseId=this.courseId
            video.addVideo(this.video)
                .then(response =>{
                    //关闭弹框
                    this.dialogVideoFormVisible=false
                    //提示
                    this.$message({
                            type: 'success',
                            message: '添加小节成功!'
                        })
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        //编辑小节数据回显
        openEditVideo(id) {
            //弹框
            this.dialogVideoFormVisible = true
            //调用接口
            video.getVideo(id)
                .then(response => {
                    this.video = response.data.video
                })
        },
        //编辑小节的方法
        updateVideo() {
            video.updateVideo(this.video)
                .then(response => {
                    //关闭弹框
                    this.dialogVideoFormVisible = false
                    //提示
                    this.$message({
                        type: 'success',
                        message: '修改小节成功!'
                    })
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        saveOrUpdateVideo(){
            if(!this.video.id){
                this.addVideo()
            }else{
                this.updateVideo()
            }
        },

        
        //================================章节操作=========================================
        //删除章节
        removeChapter(chapterId){
            this.$confirm('此操作将永久删除章节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {//点击确定，执行then方法
                //调用删除方法
                chapter.deleteChapter(chapterId)
                    .then(response=>{//删除成功
                        //提示信息
                        this.$message({
                            type: 'success',
                            message: '删除成功!'
                        })
                        //刷新页面
                        this.getChapterVideo()
                    })
            })    
        },
        //修改章节弹框数据回显
        openEditChapter(chapterId){
            //弹框
            this.dialogChapterFormVisible = true
            //调用接口
            chapter.getChapter(chapterId)
                .then(response =>{
                    this.chapter = response.data.chapter
                })
        },

        //弹出添加章节页面
        openChapterDialog(){
            //弹框
            this.dialogChapterFormVisible = true
            //表单数据清空
            this.chapter.title =''
            this.chapter.sort = 0
        },
        //添加章节
        addChapter(){
            //设置课程id到chapter对象里面
            this.chapter.courseId =this.courseId
            chapter.addChapter(this.chapter)
                .then(response => {
                    //关闭弹框
                    this.dialogChapterFormVisible=false
                    //提示
                    this.$message({
                            type: 'success',
                            message: '添加章节成功!'
                        })
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        //修改章节的方法
        updateChapter(){
            chapter.updateChapter(this.chapter)
                .then(response => {
                    //关闭弹框
                    this.dialogChapterFormVisible=false
                    //提示
                    this.$message({
                            type: 'success',
                            message: '修改章节成功!'
                        })
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        saveOrUpdate(){
            if(!this.chapter.id){
                this.addChapter()
            }else{
                this.updateChapter()
            }
        },
        //根据课程id查询章节和小节
        getChapterVideo(){
            chapter.getAllChapterVideo(this.courseId)
                .then(response=>{
                    this.chapterVideoList = response.data.allChapterVideo
                })
        },
        previous(){
            this.$router.push({path:'/course/info/'+this.courseId})
        },
        next(){
            //跳转到第二步
            this.$router.push({path:'/course/publish/'+this.courseId})
        }
    }
}
</script>
<style scoped>
.chanpterList{
   position: relative;
   list-style: none;
   margin: 0;
   padding: 0;
}
.chanpterList li{
    position: relative;
 }
 .chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
 }
 .chanpterList .acts {
    float: right;
    font-size: 14px;
 }
 .videoList{
  padding-left: 50px;
 }
 .videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
 }
 </style>